Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity

Reconciliation of number of shares outstanding with the number of shares used in computing basic and diluted earnings per share

The following table reconciles the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share for each of the periods presented (in thousands):

	Year Ended December 31,
	2018	2017	2016
Common shares outstanding, end of period	36,894	37,187	37,209
Effect of using weighted average common shares outstanding	308	52	126
Shares used in computing earnings per share—basic	37,202	37,239	37,335
Effect of shares issuable under stock option plans based on the treasury stock method	283	316	330
Effect of restricted and contingently issuable shares	107	117	146
Shares used in computing earnings per share—diluted	37,592	37,672	37,811